That's actually what I meant for the flux. I accidentally put r2 instead of r1.
I don't have the answer, but I can submit it online and know instantly if I'm correct or not. I've already used 3 out of 8 attempts.
Wow, I was way off.
If 1=sol. and 2=coil:
To find the flux of the outer coil, would this be correct: mu0*N1*I1/length * pi*r2^2 * N2 ? and then what do I do with it?
And is it ok to say M = sqrt(L1*L2) ?
And what about dI/dt ?
Maybe I'm just tired, but I'm still pretty confused.
A 40-turn, 4.0-cm-diameter coil with resistance R=.40 ohms surrounds a 3.0-cm-diameter solenoid. The solenoid is 20 cm long and has 200 turns. The 60 Hz current through the solenoid is I = I_0 * sin(2pi*f*t).
What is I_0 if the maximum current in the coil is 0.20 A?
Basically, there is a coil...